Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Converging Nozzle Ideal Ratios

Converging Nozzle Ideal Ratios

Converging Nozzle Ideal Ratios

Hi everyone,

I am new to the topics of compressible flow, and this question has been racking my brain for a while. Is there an ideal area ratio for a converging nozzle at which it no longer is beneficial to shrink the exit hole due to increased vortex growth and/or heat? This is all assuming speeds of around 0.4 mach. Thanks!

RE: Converging Nozzle Ideal Ratios

Unless your goal is to reduce the mass flow rate, in which case you can continue to reduce the hole as far as you want. You could even mount a needle on a screw thread and vary it in real time, oh wait, that's called a needle valve.

RE: Converging Nozzle Ideal Ratios

Hi Tripsahoi :

A0/A1 may be 1.2 / 1.3 (with gamma 1.4) and watching the back pressure to avoid Mach chocking as GregLocock said.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close